diff options
| author | Philipp Zabel <p.zabel@pengutronix.de> | 2012-05-16 17:28:29 +0200 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2014-06-04 11:07:11 +0200 |
| commit | e90460970fde8bdccf2147e899cb9953943e16d2 (patch) | |
| tree | 29278f3b2d38d919979ccca628448eeb1e435492 /drivers/gpu | |
| parent | gpu: ipu-v3: Add SMFC code (diff) | |
| download | linux-e90460970fde8bdccf2147e899cb9953943e16d2.tar.xz linux-e90460970fde8bdccf2147e899cb9953943e16d2.zip | |
gpu: ipu-v3: Add ipu_idmac_get_current_buffer function
This function returns the currently active buffer (0 or 1)
of a double buffered IDMAC channel. It is to be used by the
CSI driver.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/ipu-v3/ipu-common.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c index 2aecc474c478..9459f4091a27 100644 --- a/drivers/gpu/ipu-v3/ipu-common.c +++ b/drivers/gpu/ipu-v3/ipu-common.c @@ -661,6 +661,15 @@ int ipu_module_disable(struct ipu_soc *ipu, u32 mask) } EXPORT_SYMBOL_GPL(ipu_module_disable); +int ipu_idmac_get_current_buffer(struct ipuv3_channel *channel) +{ + struct ipu_soc *ipu = channel->ipu; + unsigned int chno = channel->num; + + return (ipu_cm_read(ipu, IPU_CHA_CUR_BUF(chno)) & idma_mask(chno)) ? 1 : 0; +} +EXPORT_SYMBOL_GPL(ipu_idmac_get_current_buffer); + void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num) { struct ipu_soc *ipu = channel->ipu; |